Squashed 'external/entt/entt/' content from commit fef92113

git-subtree-dir: external/entt/entt
git-subtree-split: fef921132cae7588213d0f9bcd2fb9c8ffd8b7fc

test/entt/graph/dot.cpp

@@ -0,0 +1,62 @@
+#include <sstream>
+#include <string>
+#include <gtest/gtest.h>
+#include <entt/graph/adjacency_matrix.hpp>
+#include <entt/graph/dot.hpp>
+
+TEST(Dot, DirectedGraph) {
+    std::ostringstream output{};
+    entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{3u};
+
+    adjacency_matrix.insert(0u, 1u);
+    adjacency_matrix.insert(1u, 2u);
+    adjacency_matrix.insert(0u, 2u);
+
+    entt::dot(output, adjacency_matrix);
+
+    const std::string expected = "digraph{0[];1[];2[];0->1;0->2;1->2;}";
+    const auto str = output.str();
+
+    ASSERT_FALSE(str.empty());
+    ASSERT_EQ(str, expected);
+}
+
+TEST(Dot, UndirectedGraph) {
+    std::ostringstream output{};
+    entt::adjacency_matrix<entt::undirected_tag> adjacency_matrix{3u};
+
+    adjacency_matrix.insert(0u, 1u);
+    adjacency_matrix.insert(1u, 2u);
+    adjacency_matrix.insert(0u, 2u);
+
+    entt::dot(output, adjacency_matrix);
+
+    const std::string expected = "graph{0[];1[];2[];0--1;0--2;1--0;1--2;2--0;2--1;}";
+    const auto str = output.str();
+
+    ASSERT_FALSE(str.empty());
+    ASSERT_EQ(str, expected);
+}
+
+TEST(Dot, CustomWriter) {
+    std::ostringstream output{};
+    entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{3u};
+
+    adjacency_matrix.insert(0u, 1u);
+    adjacency_matrix.insert(1u, 2u);
+    adjacency_matrix.insert(0u, 2u);
+
+    entt::dot(output, adjacency_matrix, [&adjacency_matrix](std::ostream &out, std::size_t vertex) {
+        out << "label=\"v" << vertex << "\"";
+
+        if(auto in_edges = adjacency_matrix.in_edges(vertex); in_edges.cbegin() == in_edges.cend()) {
+            out << ",shape=\"box\"";
+        }
+    });
+
+    const std::string expected = "digraph{0[label=\"v0\",shape=\"box\"];1[label=\"v1\"];2[label=\"v2\"];0->1;0->2;1->2;}";
+    const auto str = output.str();
+
+    ASSERT_FALSE(str.empty());
+    ASSERT_EQ(str, expected);
+}